An Evans−Tishchenko−Ring-Closing Metathesis Approach to Medium-Ring Lactones
作者:Jennifer I. Aird、Alison N. Hulme、John W. White
DOI:10.1021/ol062932z
日期:2007.2.1
approach to the synthesis of medium-ring lactones is reported based on sequential Evans-Tishchenko and ring-closingmetathesis (RCM) reactions. High diastereoselectivity (>95:5) is demonstrated in the Evans-Tishchenko reaction of unsaturated aldehydes with unsaturated beta-hydroxy ketones, and conditions for the RCM cyclization of the resultant dienes have been optimized to give high yields of medium
[EN] SELECTIVE BACE1 INHIBITORS<br/>[FR] INHIBITEURS DE BACE1 SÉLECTIFS
申请人:LILLY CO ELI
公开号:WO2016149057A1
公开(公告)日:2016-09-22
The present invention provides a compound of Formula I: or a pharmaceutically acceptable salt thereof.
本发明提供了化合物I的结构,或其药学上可接受的盐。
ELECTROPHILIC REACTION OF ALLYLTRIMETHYLSILANE WITH NITRILES IN THE PRESENCE OF BORON TRICHLORIDE
作者:Hiroshi Hamana、Tsutomu Sugasawa
DOI:10.1246/cl.1985.921
日期:1985.7.5
Allyltrimethylsilane reacted with various nitriles in the presence of borontrichloride, giving after hydrolysis β,γ-unsaturated ketones in high yields. The reactions of substituted allyltrimethylsilanes and intramolecular reaction of allylic trimethylsilane with nitrile were also studied.
A reaction mixture of β,γ-unsaturatedketone and BF 3 .OEt 2 in CH 3 OH was stirred at room temperature and β-methoxy ketone was produced in high yield. The β-amino ketone was obtained as the major product from a reaction mixture of β,γ-unsaturatedketone, AlCl 3 and Ts-NH 2 in CH 2 Cl 2 at room temperature. This Lewis acid promoted β-substitution reaction mechanism was proposed as that the process
The invention provides functionalized monosaccharides and disaccharides suitable for use in synthesizing a lipid A derivative, as well as methods for synthesizing and using a synthetic lipid A derivative.